Rock-drill



(No Model.)

J. L. BUOKINGHAM.

BOOK DRILL.

' Patented Sept. 16, .1890.

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W d 7, 3 5 F 5 E w w mvewiioz fl-t tm e1 UNITED STATES PATENT OFFICE.

JOHN L. BUCKINGHAM, OF HERHOSA, SOUTH DAKOTA.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 436,558, datedSeptember 16, 1890.

Application filed June 5, 1890. Serial No. 354,367. (No model.)

To aZZ whom it may concern:

Be it known that 1, JOHN L. BUOKINGHAM, a citizen of the United States,residing at Hermosa, in the county of Custer, State of South Dakota,haveinvented certain new and useful Improvements in Rock-Drills, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

This invention relates to certain new and useful improvements in drills;and it has for its object, among others, to provide a simple, cheap, anddurable sectional or joint drillstock with a detachable drill-point, thestock being provided with a receptacle, with a passage for the oil orany other unctuous sulr stances used therefrom to a receptacle orchamber in the head of the drill-point, from which an outlet is providedthrough which the oil or any other unctuous substance passes to thepoint. I provide an adjustable and removable or interchangeableapertured plug within the head of the drill-point for regulating theflow of oil or any other unctuous substance. I form the acting point ofthe drill with a funnel-shaped taper to give greater circumference andincreased cutting-edge and to force upward the chips as the rock isdrilled.

Other objects and advantages of the invention will hereinafter appear,and the novel features thereof will be particularly pointed out in theappended claims.

The invention is clearly illustrated in the accompanying drawings,which, with the let-- ters of reference marked thereon, form a part ofthis specification, and in which- Figure 1 is a side elevation of adrill and stock constructed in accordance with my invention. Fig. 2 is acentral longitudinal section through the same. Fig. 3 shows in verticalsection some of the removable and interchangeable regulating-plugs.

to the acting point. The acting point of the drill is formed with ahorizontal chisel-point 0, from which extend the cutting-edges of, whichform a sort of funnel-shaped openings or passages. The said chisel-pointbeing in substantially the center and in operation, first penei ratesthe rock and makes a small hole for the fore angle or funnel bits orpoints to follow up or cut out, cutting at all times a funnel-shapedhole at the bottom, which enables the drill when in operation to pump orforce thechips or cuttings upward, the four cutting-edges providinggreater area of cutting-edge than would be the case if the saidcutting-edges were extended at right angles to the drill, as heretofore.

B is a tube having a small central passageway I) and exterior spiralribs or extensions 1), forming a spiral passage-way or channel b At eachend this tube is formed with a shoulder b and beyond the shoulders withexternal screw-threaded reduced portions b the lower end of whichengages the screwthreaded socket a in the head of the drillpoint. Thatat the opposite end engages screw-threads upon one end of the tube 0,the opposite end of which has a large bore and forms a chamber orreceptacle for the lubricant, which is introduced thereinto through theopening or passage-way c.

In the lower end of the tube B, Ifit an apertured plug E, having anaperture of less diameter than that of the tube B, and serving todecrease the flow of lubricant fromthe tube. This plug is removablyengaged with the tube-as, for instance, by ascrew-threaded e11-gagement-and is designed to be removed and replaced by one having alarger or smaller bore, according to the amount of feed required.

The parts are employed in the manner-shown in the drawings, and may bereadily disconnected for storing, transportatiomor repairs.

What I claim as new is 1. A sectional drill-stock having an oil or otherlubricant receptacle, a passage through the stock from said receptacleto the drillpoint, and a plurality of removable andinterchangeableregulatingplugs having aper tures of dilferent sizes for insertion atthe end of the passage within the head of the drill, substantially asspecified.

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cutting-edges extending therefrom and forming funnel-shaped troughs, andan internal screw-threaded socket terminating in arecess having anoutlet, the lower wall of which is inclined outwardly and downwardly,substantially as specified.

3. The combination, with a drill-point having screw-threaded socketterminating in a recess having side outlet, of the tube B, having,exterior spiral ribs, and a central bore communicating with the recessof the drillpoint, a removable apertured plug in said bore within therecess of the drill-point, the I5 tube 0, secured to the tube B andhaving larger bore with side inlets, and the portion D, detachablyengaged with the tube 0, all substantially as and for the purposespecified.

In testimony whereof Iaflix my signaturein 2o presence of two witnesses.

JOHN L. BUOKINGHAM.

Witnesses:

JOHN F. YEATES, NIoHoLAs O. YEATES.

